Armature pose position is different orientation from initial layout in edit mode, and automatic weighting problem
In the IK constraint of your lower arm, you have to correct your Pole Angle to something like -180°. You often have to make this kind of correction after you've parented. I see you already changed to -90° but this was not enough.

I guess there are some other corrections to do. Personnaly I would parent the hand to the handle, and deparent the pole target from the handle, and make something simpler for the foot, etc... but maybe I miss something   ;)